A study on influence of acquired colostrum immunity on Lori-Bakhtiari lambs performance.
2010
Vatan Khah, Mahmud | Zamani, Farshad
In this study the number of 71 head of conceived ewe from the flock of Lori- Bakhtiari sheep with number of 360 head, in Sholi Station selected as randomly to determine influence of acquired colostrum immunity on mortality rate and performance of growth traits in lambs. The sampling of blood of ewe, colostrum of ewe and blood of lamb were taken 2 weeks before parturition, 1 to 8 hours after parturition and 36 hours after birth of lamb, respectively. The serum of samples extracted and then measured immunoglobulin G (mg/ml) in samples based on Immunodiffusion test and total serum protein (gr/l) based on Biuret method. Results showed that the overall mean of immunoglobulin G (mg/ml) were 21,33, 48,48 and 7,86 for serum blood of ewe, serum colostrum of ewe and serum blood of lamb and total serum protein (gr/l) were 71,98, 114,48 and 65,77, respectively. The effect of age of ewe, type of parturition, sex of lamb, body condition score of ewe and body weight of ewe were not significant (p0,05) on considered immunity traits. The least square means of all traits were significantly (p0,05) lower in died lambs. The concentration of immunity traits in serum of ewes, lambs and colostrums of ewes were not significant on performance of growth traits in lambs (p0,05). The regression coefficients of mortality rate on all of considered immunity traits were significant (p0,05). The correlation coefficients between immunoglobulin G in serum of blood and serum of colostrum in ewe and serum of blood in lamb were medium to high and significant (p0,05). Thus, lamb mortality can be reduced through improving the immunity level in blood of lambs by improving immunity level of ewes (through nutritional supplementation) before parturition.
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